Diff Ratio

[DanoSS]

I'm getting my diff ratio changed to a 3.9 tomorrow in my vy ss and im just wondering will the speedo need to be re-calibrated? Would i need to get it done straight away because if it says im going 60 i could be going faster?
Cheers

 

[klaw81]

If you're going from a factory diff ratio to 3.9's you will be going about 10% slower than your speedo says, not faster. If they can recalibrate it on the spot, you might as well get it done...but there's no hurry.

 

[DanoSS]

Great help, thanks for the reply!

 

[klink]

this link may help you out.

http://www.ls1.com.au/forum/showthread.php?t=49562